Have you heard of Bitcoin ? It’s a form of digital currency created, transferred and organized through cryptography that allows secure data to be exchanged over the Internet. While that description might make Bitcoin sound more like the trinkets characters collect in computer games than real money, the virtual currency can increasingly be used to buy real goods and services. Companies as diverse as WordPress and GrubGo , a St. Louis-based restaurant delivery service, now accept Bitcoin. GrubGo’s decision to accept Bitcoin drove up traffic to the website and endeared the company to tech experts who pointed out flaws that hackers could exploit. “Just because we started accepting Bitcoin, they wanted to make sure we were taken care of,” says Matt Hanley, one of the founders of GrubGo, which also provides technology services to restaurants. “It helps getting your name out ther...